Performance
Lab data — simulated mobile 51
Before 82 After
Lab metrics
Metric
Before
With Turbulence
Speed Index SI
Before: 11 s
After: 10 s -7%
First Contentful Paint FCP
Before: 6.0 s
After: 2.7 s -55%
Largest Contentful Paint LCP
Before: 37 s
After: 2.9 s -92%
Cumulative Layout Shift CLS
Before: 0.000
After: 0.011
Total Blocking Time TBT
Before: 259 ms
After: 87 ms -66%
What changed (4)
- Resource hints injected Browser knows what to fetch early
- Images re-encoded to AVIF/WebP Smaller image files that look the same
- Images re-encoded to AVIF/WebP Smaller image files that look the same
- Image dimensions explicitly set Explicit dimensions prevent layout shifts
How we measured this
- 1. We fetched your page and scored it with PageSpeed Insights (mobile, lab data).
- 2. We re-fetched it through a Turbulence preview environment that applies our transformation pipeline.
- 3. We scored the result with PageSpeed Insights again.
- 4. The deltas above are the difference — a directional estimate, not a forecast. First visits, geographic location, network conditions, and JS-rendered content all affect real-world results.